fix(README): typo error in Node.js usage example (#93)

Author: babblebey

README.md

@@ -197,10 +197,12 @@ If you use Node.js, you can convert the format before passing it to `universal-g
 import crypto from "node:crypto";
 import githubAppJwt from "universal-github-app-jwt";
 
-const privateKeyPkcs8 = crypto.createPrivateKey(process.env.PRIVATE_KEY).export({
-  type: "pkcs8",
-  format: "pem",
-}
+const privateKeyPkcs8 = crypto
+  .createPrivateKey(process.env.PRIVATE_KEY)
+  .export({
+    type: "pkcs8",
+    format: "pem",
+  });
 
 const { token, appId, expiration } = await githubAppJwt({
   id: process.env.APP_ID,